80 ILLINOIS BIOLOGICAL MONOGRAPHS [80 



are rather rare and their larvae, so far as I know, have not been recog- 

 nized. 



Family Elachistidae 



The Tineidae and Elachistidae have long been dumping grounds 

 for all manner of Microlepidoptera. It is within the last five or six 

 years (1909) that Busck has pointed out the necessity of dividing and 

 redividing these "families". The Elachistidae appear to contain six 

 well defined groups, five in addition to those related to Elachista. These 

 are now known as Cycnidioidea, Coleophoridae, Cosmopterygidae, Helio- 

 dinidae, and Scythridinae of Yponomeutidae. Larvae of the true Ela- 

 chistidae and of the superfamily Cycnidioidea have not been examined. 

 Scythridinae and Heliodinidae are discussed in their proper place in the 

 Yponomeutoidea. Cosmopterygidae will be found under Gelechioidea 

 while Coleophoridae apparently do not belong in any of the superfamilies 

 listed in this paper. 



Family Coleophoridae 



Head scarcely depressed; front extending about two-thirds, ad- 

 frontals all the way to the vertical triangle; ocelli all close together, 

 seta vii closest to second ocellus, fourth ocellus usually as close to sixth 

 as to fifth. Body cylindrical, setae almost indistinguishable, apparently 

 in the normal microlepidopterous arrangement. Thoracic legs about as 

 far apart as the width of the coxae ; ventral prolegs each bearing two 

 transverse uniserial bands of uniordinal crochets, usually so close to 

 ventromeson that the bands of the right and left sides are nearly con- 

 tinuous with each other; anal prolegs each with a single transverse row 

 close to ventromeson. Crochets reduced in number in some species, 

 either rudimentary and reduced from two to six for each proleg as in 

 Coleophora fletcherella, or entirely wanting as in C. limospenella. Spi- 

 racles small, circular, those of the eighth abdominal segment twice as 

 large and slightly farther dorsad than those of other segments. 



The following species of Coleophora were seen, all of them having 

 transverse rows of crochets except as noted above : tiliaefoliella, atripli- 

 civora, fletcherella, gallipenella, ochripenella, limospenella, and several 

 others unidentified. 



SUPERFAMILY GELECHIOIDEA 



This- group includes the most highly specialized of the tineoid series 

 of Microlepidoptera. Some of the families are difficult to separate in 

 any stage, especially as Gelechia seems to be rather a generalized genus 

 from which several others diverged. The characters are such that the 



